Note on sizing - 1st dimension listed is width, second dimension is height. If your opening is 20" wide by 14" tall, order a 20x14. If your opening is 14" wide by 20" tall, order a 14x20. Grille slats run long with width of the grille.

Note on sizing - 1st dimension listed is width, second dimension is height. If your opening is 20" wide by 14" tall, order a 20x14. If your opening is 14" wide by 20" tall, order a 14x20. Grille slats run long with width of the grille.